Microsoft's upcoming Windows operating system, Windows 7, is slated for an October 22 release; however, the Redmond software giant allowed people to begin pre-ordering much earlier to beat the rush... and it seems this offer was quite well received in Japan.

According to Engadget, Windows 7 has completely sold out of pre-orderable copies in Japan, which combines sales from the 17 retailers involved with the early orders. Apparently, this is a grand total of about 30,000 copies of the operating system, and it took 1.5 days (out of the 10 that were allocated) for this event to happen. Don't think that this offer hasn't been popular in the U.S., though; Windows 7 immediately shot to the top of Amazon sales.

It's evident that this new piece of software is proving to be very popular for Microsoft, already pulling in rave reviews of the beta and release candidate builds. It will certainly provide a fresh dose of PR after the last operating system the company released. Here on Neowin, however, out of the 1396 votes (at the time of writing), only 561 people have planned to take advantage of the offer. The pre-order offer started a few days ago and will last until July 11, so if you haven't got around to it yet, it's best to do so soon.